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T4学习- 2、创建设计时模板

　　使用设计时 T4 文本模板，您可以在 Visual Studio 项目中生成程序代码和其他文件。通常，您编写一些模板，以便它们根据来自模型的数据来改变所生成的代码。模型是包含有关应用程序要求的关键信息的文件或数据库。像一些常用的框架，基本都是根据数据库模型来生成代码框架的。

一、具体步骤

1、选择“文本模板”

　　新建项目名为：T4Sample，添加新项，选择“文本模板”即可创建设计时模板

模板属性，请确认：

自定义工具 = TextTemplatingFileGenerator
生成操作 = 无

打开模板，默认下面几行语句

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".txt" #>

2、修改模板

　　依然以HelloWorld为例

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Text" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ output extension=".cs" #>
 
using System;

namespace Test
{
    public class HelloWorld
    { 
        public static void Main(string[] args)
        {
            <# 
            List<Person> people = GetPersonList();
            foreach(Person p in people)
            {
            #>
            Console.WriteLine("Hello {0},Welcome to T4 World!","<#= p.Name #>");
            <#}
            #>
        }
    }
}

<#+
//类
public class Person
{
    ///名称
    public string Name{ get; set; }

    public Person(string name)
    {
        this.Name = name;
    }
}
//初始化众人
public List<Person> GetPersonList()
{
    List<Person> people = new List<Person>();

    Person p1 = new Person("Tom");
    Person p2 = new Person("Jim");
    Person p3 = new Person("Lucy");

    people.Add(p1);
    people.Add(p2);
    people.Add(p3);

    return people;
}

#>

3、生成代码

　　可通过以下方式

保存,自动转换模板。
或者右击模板文件，选择“运行自定义工具”
或者在“解决方案资源管理器”工具栏中单击“转换所有模板”。这将转换 Visual Studio 解决方案中的所有模板。

生成代码如下：

using System;

namespace Test
{
    public class HelloWorld
    {
        public static void Main(string[] args)
        {
            Console.WriteLine("Hello {0},Welcome to T4 World!", "Tom");
            Console.WriteLine("Hello {0},Welcome to T4 World!", "Jim");
            Console.WriteLine("Hello {0},Welcome to T4 World!", "Lucy");
        }
    }
}

二、模板指令

　　C#代码与T4不同，就是引用、调试、输出等方面，而T4中最重要的指令Template ，就包含这些不同。所以这里特别重点强调下指令Template。

使用 Template 指令

<#@ template [language="C#"] [hostspecific="true"] [debug="true"] [inherits="templateBaseClass"] [culture="code"][compilerOptions="options"] #>

template 指令有多个特性，通过这些特性可以指定转换的不同方面。所有特性都是可选的。

1、compilerOptions 特性

示例：
compilerOptions="optimize+"
有效值：
任何有效的编译器选项。
在模板已经转换为 Visual C# 或 Visual Basic 并且生成的代码已编译时会应用这些选项。

2、culture 特性

示例：
    culture="de-CH"
有效值：
    ""，不变的区域性，它是默认值。
    表示为 xx-XX 形式字符串的区域性。例如：en-US、ja-JP、de-CH、de-DE。
Culture 特性指定将表达式块转换为文本时要使用的区域性。

3、debug 特性

示例：
debug="true"
有效值：
true, false. 默认值为 false。
debug 特性指定是否启用调试。如果是 true，则中间代码文件将包含使调试器能够识别模板中中断或异常发生位置的信息。对于设计时模板，中间代码文件将写入您的 %TEMP% 目录。
若要在模板执行的特定点启动调试器，请插入对 Launch 的调用。若要在后续的点处中断执行，请插入对 Break 的调用。

<#@ template debug="true" language="C#" #>
<#@ output extension=".txt" #>
Output something.
<#
 // Break here:
 System.Diagnostics.Debugger.Launch();  
#>
Output more.
<#
 // Break here also:
 System.Diagnostics.Debugger.Break();  
#>
Output more.

4、hostspecific 特性

有效值：
true, false. 默认值为 false。
如果将此特性的值设置为 true，则会将名为 Host 的属性添加到由文本模板生成的类中。该属性是对转换引擎的宿主的引用，并声明为 Microsoft.VisualStudio.TextTemplating.ITextTemplatingEngineHost。如果已经定义了自定义宿主，则可以将其转换为自定义宿主类型。因为此属性的类型取决于宿主的类型，所以仅当编写只适用于特定宿主的文本模板时才有用。
当 hostspecific 为 true，而且正在使用 Visual Studio 时，可以将 this.Host 强制转换为 IServiceProvider，以访问 Visual Studio 功能。还可以使用 Host.ResolvePath(filename) 来获得项目中文件的绝对路径。

5、language 特性

示例：
    language="VB"
有效值：
    C#（默认值）
    VB（值 VBv3.5 和 C#v3.5 在此版本中已过时，但是会解释为 VB 和 C#。）
language 特性指定要用于语句和表达式块中的源代码的语言（Visual Basic 或 Visual C#）。从中生成输出的中间代码文件将使用此语言。此语言与您的模板生成的语言无关，它可以是任何类型的文本。

6、inherits 特性

可以指定模板的程序代码可以继承自另一个类，这个类也可以从文本模板生成。

三、实例：代码生成器

该实例，就是我们通常见过的，模型代码生成器，根据数据模型生成代码框架，如模型层、数据访问层等。本实例先根据数据表，生存模型层代码。这是一个简单实例，如果有功夫，您可以根据这个原理写出自己的代码生成框架。

<#@ template debug="false" hostspecific="false" language="C#" #>
<#@ output extension=".cs" #>
<#@ assembly name="System.Data" #>
<#@ assembly name="System.Xml" #>
<#@ import namespace="System" #>
<#@ import namespace="System.Xml" #>
<#@ import namespace="System.Data" #>
<#@ import namespace="System.Data.SqlClient" #>
<# 
ModelManager manager = new ModelManager();
string tableName = "Dictionary";
DataTable table= manager.GetTableSchema(tableName);
#>
using System;

namespace Model
{
    public class <#= tableName #>
    {
        <#
        foreach(DataRow row in table.Rows)
        {
        #>
        public <#= manager.TransFromSqlType(row["DataType"].ToString())#> <#=row["ColumnName"]#>{ get; set; }

        <#}
        #>
    }
}

<#+
    public class ModelManager
    {
        /// <summary>
        /// 获得数据连接
        /// </summary>
        /// <returns></returns>
        private SqlConnection GetConnection()
        {
            return new SqlConnection("server=10.126.124.0;database=ZSOtherData;uid=it_zs;pwd=dev4ZS@2018;");
        }
 

        /// <summary>
        /// 
        /// </summary>
        /// <param name="tableName"></param>
        public DataTable GetTableSchema(string tableName)
        {
            DataTable dt;
            using (SqlConnection con = GetConnection())
            {
                con.Open();

                SqlCommand cmd = con.CreateCommand();
                cmd.CommandText = string.Format(@"SELECT  TABLE_NAME AS TableName  ,
                                                                    ORDINAL_POSITION AS ColumnID ,
                                                                    COLUMN_NAME AS ColumnName ,
                                                                    DATA_TYPE AS DataType ,
                                                                    CASE WHEN IS_NULLABLE = 'NO' THEN 'false'
                                                                         ELSE 'true'
                                                                    END AS IsNullable
                                                            FROM    INFORMATION_SCHEMA.COLUMNS AS A
                                                                    LEFT JOIN sysobjects AS B ON A.TABLE_NAME = B.name
                                                            WHERE   A.TABLE_NAME = '{0}'",tableName);
                cmd.CommandType = CommandType.Text;

                SqlDataAdapter adapter = new SqlDataAdapter(cmd);
                DataSet ds = new DataSet(); 
                adapter.Fill(ds);
                dt = ds.Tables[0];
            }

            return dt;
        }
        /// <summary>
        /// SQL
        /// </summary>
        /// <param name="type"></param>
        /// <returns></returns>
        public string TransFromSqlType(string type)
        {
            if (string.IsNullOrEmpty(type))
            {
                return string.Empty;
            }

            if (string.Equals(type, "int", StringComparison.OrdinalIgnoreCase))
            {
                return "int";
            }
            else if (string.Equals(type, "varchar", StringComparison.OrdinalIgnoreCase))
            {
                return "string";
            }

            return "string";
        }

    }
#>

四、调试T4模板

你可以在T4文本模板中设置断点。

要调试的设计时文本模板，将文本模板文件，保存，然后选择解决方案资源管理器中的文件的快捷菜单上的“调试 T4 模板”。
若要调试的运行时文本模板，只需调试它属于该应用程序。

1、

五、一次生成多个文件

https://blog.csdn.net/shuai7boy/article/details/53203294

一次生成一个文件：

Customers.tt

<#@ include file="$(ProjectDir)DbHelper.ttinclude"  #>
using System;
namespace T4ConsoleApplication.Entities
{    
    public class <#=config.TableName#>
    {
        <# foreach(DbColumn column in DbHelper.GetDbColumns(config.ConnectionString, config.DbDatabase, config.TableName)){#>
      
        public <#= column.CSharpType#><# if(column.CommonType.IsValueType && column.IsNullable){#>?<#}#> <#=column.ColumnName#> { get; set; }
        <#}#>      
    }
}

<#+
    public class config
    {
        //修改要生成的数据库表
        public static readonly string ConnectionString="server=10.126.124.60;database=ZSOtherData;uid=it_zs;pwd=dev4ZS@2018;";
        public static readonly string DbDatabase="ZSOtherData";
        public static readonly string TableName="Mould";
    }
#>

View Code

DbHelper.ttinclude

<#@ assembly name="System.Core.dll" #>
<#@ assembly name="System.Data.dll" #>
<#@ assembly name="System.Data.DataSetExtensions.dll" #>
<#@ assembly name="System.Xml.dll" #>
<#@ import namespace="System" #>
<#@ import namespace="System.Data" #>
<#@ import namespace="System.Xml" #>
<#@ import namespace="System.Linq" #>
<#@ import namespace="System.Data" #>
<#@ import namespace="System.Data.SqlClient" #>
<#@ import namespace="System.Collections.Generic" #>
<#+
    public class DbHelper
    {
        #region GetDbTables
        
        public static List<DbTable> GetDbTables(string connectionString, string database, string tables = null)
        {
            
            if (!string.IsNullOrEmpty(tables))
            {
                tables = string.Format(" and obj.name in ('{0}')", tables.Replace(",", "','"));
            }
            #region SQL
            string sql = string.Format(@"SELECT
                                    obj.name tablename,
                                    schem.name schemname,
                                    idx.rows,
                                    CAST
                                    (
                                        CASE 
                                            WHEN (SELECT COUNT(1) FROM sys.indexes WHERE object_id= obj.OBJECT_ID AND is_primary_key=1) >=1 THEN 1
                                            ELSE 0
                                        END 
                                    AS BIT) HasPrimaryKey                                         
                                    from {0}.sys.objects obj 
                                    inner join {0}.dbo.sysindexes idx on obj.object_id=idx.id and idx.indid<=1
                                    INNER JOIN {0}.sys.schemas schem ON obj.schema_id=schem.schema_id
                                    where type='U' {1}
                                    order by obj.name", database, tables);
            #endregion
            DataTable dt = GetDataTable(connectionString, sql);
            return dt.Rows.Cast<DataRow>().Select(row => new DbTable
            {
                TableName = row.Field<string>("tablename"),
                SchemaName = row.Field<string>("schemname"),
                Rows = row.Field<int>("rows"),
                HasPrimaryKey = row.Field<bool>("HasPrimaryKey")
            }).ToList();
        }
        #endregion

        #region GetDbColumns
        
        public static List<DbColumn> GetDbColumns(string connectionString, string database, string tableName, string schema = "dbo")
        {
            #region SQL
            string sql = string.Format(@"
                                    WITH indexCTE AS
                                    (
                                        SELECT 
                                        ic.column_id,
                                        ic.index_column_id,
                                        ic.object_id    
                                        FROM {0}.sys.indexes idx
                                        INNER JOIN {0}.sys.index_columns ic ON idx.index_id = ic.index_id AND idx.object_id = ic.object_id
                                        WHERE  idx.object_id =OBJECT_ID(@tableName) AND idx.is_primary_key=1
                                    )
                                    select
                                    colm.column_id ColumnID,
                                    CAST(CASE WHEN indexCTE.column_id IS NULL THEN 0 ELSE 1 END AS BIT) IsPrimaryKey,
                                    colm.name ColumnName,
                                    systype.name ColumnType,
                                    colm.is_identity IsIdentity,
                                    colm.is_nullable IsNullable,
                                    cast(colm.max_length as int) ByteLength,
                                    (
                                        case 
                                            when systype.name='nvarchar' and colm.max_length>0 then colm.max_length/2 
                                            when systype.name='nchar' and colm.max_length>0 then colm.max_length/2
                                            when systype.name='ntext' and colm.max_length>0 then colm.max_length/2 
                                            else colm.max_length
                                        end
                                    ) CharLength,
                                    cast(colm.precision as int) Precision,
                                    cast(colm.scale as int) Scale,
                                    prop.value Remark
                                    from {0}.sys.columns colm
                                    inner join {0}.sys.types systype on colm.system_type_id=systype.system_type_id and colm.user_type_id=systype.user_type_id
                                    left join {0}.sys.extended_properties prop on colm.object_id=prop.major_id and colm.column_id=prop.minor_id
                                    LEFT JOIN indexCTE ON colm.column_id=indexCTE.column_id AND colm.object_id=indexCTE.object_id                                        
                                    where colm.object_id=OBJECT_ID(@tableName)
                                    order by colm.column_id", database);
            #endregion
            SqlParameter param = new SqlParameter("@tableName", SqlDbType.NVarChar, 100) { Value = string.Format("{0}.{1}.{2}", database, schema, tableName) };
              DataTable dt = GetDataTable(connectionString, sql, param);            

            return dt.Rows.Cast<DataRow>().Select(row => new DbColumn()
            {
                ColumnID = row.Field<int>("ColumnID"),
                IsPrimaryKey = row.Field<bool>("IsPrimaryKey"),
                ColumnName = row.Field<string>("ColumnName"),
                ColumnType = row.Field<string>("ColumnType"),
                IsIdentity = row.Field<bool>("IsIdentity"),
                IsNullable = row.Field<bool>("IsNullable"),
                ByteLength = row.Field<int>("ByteLength"),
                CharLength = row.Field<int>("CharLength"),
                Scale = row.Field<int>("Scale"),
                Remark = row["Remark"].ToString()
            }).ToList();
        }

        #endregion     


        #region GetDataTable
        
        public static DataTable GetDataTable(string connectionString, string commandText, params SqlParameter[] parms)
        {
            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = connection.CreateCommand();
                command.CommandText = commandText;
                command.Parameters.AddRange(parms);
                SqlDataAdapter adapter = new SqlDataAdapter(command);                
                DataTable dt = new DataTable();
                adapter.Fill(dt);
                
                return dt;
            }
        }

        #endregion
    }

    #region DbTable
    /// <summary>
    /// 表结构
    /// </summary>
    public sealed class DbTable
    {
        /// <summary>
        /// 表名称
        /// </summary>
        public string TableName { get; set; }
        /// <summary>
        /// 表的架构
        /// </summary>
        public string SchemaName { get; set; }
        /// <summary>
        /// 表的记录数
        /// </summary>
        public int Rows { get; set; }

        /// <summary>
        /// 是否含有主键
        /// </summary>
        public bool HasPrimaryKey { get; set; }
    }
    #endregion

    #region DbColumn
    /// <summary>
    /// 表字段结构
    /// </summary>
    public sealed class DbColumn
    {
        /// <summary>
        /// 字段ID
        /// </summary>
        public int ColumnID { get; set; }

        /// <summary>
        /// 是否主键
        /// </summary>
        public bool IsPrimaryKey { get; set; }

        /// <summary>
        /// 字段名称
        /// </summary>
        public string ColumnName { get; set; }

        /// <summary>
        /// 字段类型
        /// </summary>
        public string ColumnType { get; set; }

        /// <summary>
        /// 数据库类型对应的C#类型
        /// </summary>
        public string CSharpType
        {
            get
            {
                return SqlServerDbTypeMap.MapCsharpType(ColumnType);
            }
        }

        /// <summary>
        /// 
        /// </summary>
        public Type CommonType
        {
            get
            {
                return SqlServerDbTypeMap.MapCommonType(ColumnType);
            }
        }

        /// <summary>
        /// 字节长度
        /// </summary>
        public int ByteLength { get; set; }

        /// <summary>
        /// 字符长度
        /// </summary>
        public int CharLength { get; set; }

        /// <summary>
        /// 小数位
        /// </summary>
        public int Scale { get; set; }

        /// <summary>
        /// 是否自增列
        /// </summary>
        public bool IsIdentity { get; set; }

        /// <summary>
        /// 是否允许空
        /// </summary>
        public bool IsNullable { get; set; }

        /// <summary>
        /// 描述
        /// </summary>
        public string Remark { get; set; }
    }
    #endregion

    #region SqlServerDbTypeMap

    public class SqlServerDbTypeMap
    {
        public static string MapCsharpType(string dbtype)
        {
            if (string.IsNullOrEmpty(dbtype)) return dbtype;
            dbtype = dbtype.ToLower();
            string csharpType = "object";
            switch (dbtype)
            {
                case "bigint": csharpType = "long"; break;
                case "binary": csharpType = "byte[]"; break;
                case "bit": csharpType = "bool"; break;
                case "char": csharpType = "string"; break;
                case "date": csharpType = "DateTime"; break;
                case "datetime": csharpType = "DateTime"; break;
                case "datetime2": csharpType = "DateTime"; break;
                case "datetimeoffset": csharpType = "DateTimeOffset"; break;
                case "decimal": csharpType = "decimal"; break;
                case "float": csharpType = "double"; break;
                case "image": csharpType = "byte[]"; break;
                case "int": csharpType = "int"; break;
                case "money": csharpType = "decimal"; break;
                case "nchar": csharpType = "string"; break;
                case "ntext": csharpType = "string"; break;
                case "numeric": csharpType = "decimal"; break;
                case "nvarchar": csharpType = "string"; break;
                case "real": csharpType = "Single"; break;
                case "smalldatetime": csharpType = "DateTime"; break;
                case "smallint": csharpType = "short"; break;
                case "smallmoney": csharpType = "decimal"; break;
                case "sql_variant": csharpType = "object"; break;
                case "sysname": csharpType = "object"; break;
                case "text": csharpType = "string"; break;
                case "time": csharpType = "TimeSpan"; break;
                case "timestamp": csharpType = "byte[]"; break;
                case "tinyint": csharpType = "byte"; break;
                case "uniqueidentifier": csharpType = "Guid"; break;
                case "varbinary": csharpType = "byte[]"; break;
                case "varchar": csharpType = "string"; break;
                case "xml": csharpType = "string"; break;
                default: csharpType = "object"; break;
            }
            return csharpType;
        }
           
        public static Type MapCommonType(string dbtype)
        {
            if (string.IsNullOrEmpty(dbtype)) return Type.Missing.GetType();
            dbtype = dbtype.ToLower();
            Type commonType = typeof(object);
            switch (dbtype)
            {
                case "bigint": commonType = typeof(long); break;
                case "binary": commonType = typeof(byte[]); break;
                case "bit": commonType = typeof(bool); break;
                case "char": commonType = typeof(string); break;
                case "date": commonType = typeof(DateTime); break;
                case "datetime": commonType = typeof(DateTime); break;
                case "datetime2": commonType = typeof(DateTime); break;
                case "datetimeoffset": commonType = typeof(DateTimeOffset); break;
                case "decimal": commonType = typeof(decimal); break;
                case "float": commonType = typeof(double); break;
                case "image": commonType = typeof(byte[]); break;
                case "int": commonType = typeof(int); break;
                case "money": commonType = typeof(decimal); break;
                case "nchar": commonType = typeof(string); break;
                case "ntext": commonType = typeof(string); break;
                case "numeric": commonType = typeof(decimal); break;
                case "nvarchar": commonType = typeof(string); break;
                case "real": commonType = typeof(Single); break;
                case "smalldatetime": commonType = typeof(DateTime); break;
                case "smallint": commonType = typeof(short); break;
                case "smallmoney": commonType = typeof(decimal); break;
                case "sql_variant": commonType = typeof(object); break;
                case "sysname": commonType = typeof(object); break;
                case "text": commonType = typeof(string); break;
                case "time": commonType = typeof(TimeSpan); break;
                case "timestamp": commonType = typeof(byte[]); break;
                case "tinyint": commonType = typeof(byte); break;
                case "uniqueidentifier": commonType = typeof(Guid); break;
                case "varbinary": commonType = typeof(byte[]); break;
                case "varchar": commonType = typeof(string); break;
                case "xml": commonType = typeof(string); break;
                default: commonType = typeof(object); break;
            }
            return commonType;
        }
    }
    #endregion
#>

View Code

一次生成多个文件

Entity.tt

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ assembly name="System.Data" #>
<#@ assembly name="System.xml" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="System.Data.SqlClient" #>
<#@ import namespace="System.Data" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>

//  导入MultipleOutputHelper.ttinclude文件
<#@ include file="$(ProjectDir)MultipleOutputHelper.ttinclude" #>

<#        
        string connectionString= "server=10.126.124.0;database=ZSOtherData;uid=it_zs;pwd=dev4ZS@2018;";        
        SqlConnection conn = new SqlConnection(connectionString);
        conn.Open();
    
        string selectQuery ="SET FMTONLY ON; select * from @tableName; SET FMTONLY OFF;";
        SqlCommand command = new SqlCommand(selectQuery,conn);
        SqlDataAdapter ad = new SqlDataAdapter(command);
        System.Data.DataSet ds = new DataSet(); 
  
        var manager = Manager.Create(Host, GenerationEnvironment);  

        System.Data.DataTable schema = conn.GetSchema("Tables");
        foreach(System.Data.DataRow row in schema.Rows)
        {    
            ds.Tables.Clear();
            string tb_name= row["TABLE_NAME"].ToString();        
            command.CommandText = selectQuery.Replace("@tableName",row["TABLE_NAME"].ToString());
            ad.FillSchema(ds, SchemaType.Mapped,tb_name);  

            manager.StartNewFile(tb_name+".cs");#>

using System;
using System.Collections.Generic;
namespace MY.Model
{    
    /// <summary>
    /// 实体-<#=tb_name#> 
    /// </summary>
    public partial class <#=tb_name#>    
    {    
        <#
        PushIndent("          ");
        foreach (DataColumn dc in ds.Tables[0].Columns) 
        {
            WriteLine("public " + dc.DataType.Name+ (dc.AllowDBNull && dc.DataType.Name.ToLower() != "string" ? "? ": " ") + dc.ColumnName + " { get; set; }");
        }
        PopIndent();
        #>
    }
}
    
<#
        manager.EndBlock();    
         }            
        conn.Close();  
       manager.Process(true);  
        #>

View Code

Action.tt

<#@ template debug="false" hostspecific="true" language="C#" #>
<#@ assembly name="System.Data" #>
<#@ assembly name="System.xml" #>
<#@ import namespace="System.Collections.Generic" #>
<#@ import namespace="System.Data.SqlClient" #>
<#@ import namespace="System.Data" #>
<#@ assembly name="System.Core" #>
<#@ import namespace="System.Linq" #>

//  导入MultipleOutputHelper.ttinclude文件
<#@ include file="$(ProjectDir)MultipleOutputHelper.ttinclude" #>
<#        
        string connectionString= "server=10.126.124.0;database=ZSOtherData;uid=it_zs;pwd=dev4ZS@2018;";        
        SqlConnection conn = new SqlConnection(connectionString);
        conn.Open();
    
        string selectQuery ="SET FMTONLY ON; select * from @tableName; SET FMTONLY OFF;";
        SqlCommand command = new SqlCommand(selectQuery,conn);
        SqlDataAdapter ad = new SqlDataAdapter(command);
        System.Data.DataSet ds = new DataSet(); 
  
        var manager = Manager.Create(Host, GenerationEnvironment);  

        System.Data.DataTable schema = conn.GetSchema("Tables");
        foreach(System.Data.DataRow row in schema.Rows)
        {    
            ds.Tables.Clear();
            string tb_name= row["TABLE_NAME"].ToString();        
            command.CommandText = selectQuery.Replace("@tableName",row["TABLE_NAME"].ToString());
            ad.FillSchema(ds, SchemaType.Mapped,tb_name);  
            manager.StartNewFile(tb_name+"Action.cs");#>


using System;
using System.Collections.Generic;
using MY.Model;
namespace MY.BLL
{    
    
    /// <summary>
    /// <#=tb_name#> 操作类
    /// </summary>
    public partial class <#=tb_name#>Action
    {<#
        string fkQuery = " SELECT f.name AS ForeignKey,";
        fkQuery += " OBJECT_NAME(f.parent_object_id) AS TableName, ";
        fkQuery += " COL_NAME(fc.parent_object_id, fc.parent_column_id) AS ColumnName, ";
        fkQuery += " OBJECT_NAME (f.referenced_object_id) AS ReferenceTableName, ";
        fkQuery += " COL_NAME(fc.referenced_object_id, fc.referenced_column_id) AS ReferenceColumnName ";
        fkQuery += " FROM ";
        fkQuery += " sys.foreign_keys AS f ";
        fkQuery += " INNER JOIN sys.foreign_key_columns AS fc ON f.OBJECT_ID = fc.constraint_object_id ";
        fkQuery += " where OBJECT_NAME(f.parent_object_id) = '" +tb_name +"'";

        List<string> fkColumnNames = new List<string>();
        Dictionary<string, string> parentTables = new Dictionary<string, string>();
    
        SqlCommand command2 = new SqlCommand(fkQuery,conn);
        using(var dr = command2.ExecuteReader())
        {
            while(dr.Read())
            {
                fkColumnNames.Add(dr["ColumnName"].ToString());
                parentTables.Add(dr["ColumnName"].ToString(), dr["ReferenceTableName"].ToString());
            }
            dr.Close();
        }
    
        
    

        List<DataColumn> fkColumns = new List<DataColumn>();
        foreach(string fkColumnName in fkColumnNames)
        {
            foreach (DataColumn dc in ds.Tables[0].Columns) 
            {
                if(dc.ColumnName == fkColumnName)
                    fkColumns.Add(dc);
            }
        }

        List<string> primaryKeyParamsWithTypes = new List<string>();
        List<string> primaryKeyParams = new List<string>();
        List<string> whereItems = new List<string>();
        List<string> automapItems = new List<string>();
        foreach(DataColumn pk in ds.Tables[0].PrimaryKey)
        {
            primaryKeyParamsWithTypes.Add(string.Format("{0} {1}", pk.DataType.Name, this.ToCamelCase(pk.ColumnName)));
            primaryKeyParams.Add(pk.ColumnName);
            whereItems.Add(string.Format("{0} = @{1}", pk.ColumnName, pk.ColumnName.ToLower()));
            automapItems.Add(string.Format("x.{0}", pk.ColumnName));
        }

        string updateAutomap = string.Empty;
    if(automapItems.Count > 0){
        if(automapItems.Count > 1)
            updateAutomap = "new { " + string.Join(", ", automapItems.ToArray()) + " }";
        else
            updateAutomap = automapItems[0];
            }
        #>

        

        public static <#=tb_name#> Select(<#=string.Join(", ", primaryKeyParamsWithTypes.ToArray())#>)
        {
            using(var context = db.Context())
            {
                return context.Sql(" SELECT * FROM <#=tb_name#> WHERE <#=string.Join(" AND ", whereItems.ToArray())#> ")
                    <#foreach(string pkp in primaryKeyParams) 
                    {
                        WriteLine(".Parameter("" + pkp.ToLower() + "", " + this.ToCamelCase(pkp) + ")");
                    }
                    #>
                    .QuerySingle<<#=tb_name#>>();
            }
        }

        public static List<<#=tb_name#>> SelectAll()
        {
            return SelectAll(string.Empty);
        }

        public static List<<#=tb_name#>> SelectAll(string sortExpression)
        {
            return SelectAll(0, 0, sortExpression);
        }

        public static List<<#=tb_name#>> SelectAll(int startRowIndex, int maximumRows, string sortExpression)
        {
            using (var context = db.Context())
            {
                var select = context.Select<<#=tb_name#>>(" * ")
                    .From(" <#=tb_name#> ");

                if (maximumRows > 0)
                {
                    if (startRowIndex == 0) 
                        startRowIndex = 1;

                    select.Paging(startRowIndex, maximumRows);
                }

                if (!string.IsNullOrEmpty(sortExpression))
                    select.OrderBy(sortExpression);

                return select.QueryMany();
            }
        }

        public static int CountAll()
        {
            using (var context = db.Context())
            {
                return context.Sql(" SELECT COUNT(*) FROM <#=tb_name#> ")
                    .QuerySingle<int>();
            }
        }

        <#
        foreach(DataColumn dc in fkColumns)
        {
        #>

        public static List<<#=tb_name#>> SelectBy<#=parentTables[dc.ColumnName]#>(<#=dc.DataType.Name#> <#=this.ToCamelCase(dc.ColumnName)#>)
        {
            return SelectBy<#=parentTables[dc.ColumnName]#>(<#=this.ToCamelCase(dc.ColumnName)#>, string.Empty);
        }

        public static List<<#=tb_name#>> SelectBy<#=parentTables[dc.ColumnName]#>(<#=dc.DataType.Name#> <#=this.ToCamelCase(dc.ColumnName)#>, string sortExpression)
        {
            return SelectBy<#=parentTables[dc.ColumnName]#>(<#=this.ToCamelCase(dc.ColumnName)#>, 0, 0, sortExpression);
        }

        public static List<<#=tb_name#>> SelectBy<#=parentTables[dc.ColumnName]#>(<#=dc.DataType.Name#> <#=this.ToCamelCase(dc.ColumnName)#>, int startRowIndex, int maximumRows, string sortExpression)
        {
            using (var context = db.Context())
            {
                var select = context.Select<<#=tb_name#>>(" * ")
                    .From(" <#=tb_name#> ")
                    .Where(" <#=dc.ColumnName#> = @<#=dc.ColumnName.ToLower()#> ")
                    .Parameter("<#=dc.ColumnName.ToLower()#>", <#=this.ToCamelCase(dc.ColumnName)#>);

                if (maximumRows > 0)
                {
                    if (startRowIndex == 0) 
                        startRowIndex = 1;

                    select.Paging(startRowIndex, maximumRows);
                }

                if (!string.IsNullOrEmpty(sortExpression))
                    select.OrderBy(sortExpression);

                return select.QueryMany();
            }
        }

        public static int CountBy<#=parentTables[dc.ColumnName]#>(<#=dc.DataType.Name#> <#=this.ToCamelCase(dc.ColumnName)#>)
        {
            using (var context = db.Context())
            {
                return context.Sql(" SELECT COUNT(*) FROM <#=tb_name#> WHERE <#=dc.ColumnName#> = @<#=dc.ColumnName.ToLower()#>")
                    .Parameter("<#=dc.ColumnName.ToLower()#>", <#=this.ToCamelCase(dc.ColumnName)#>)
                    .QuerySingle<int>();
            }
        }
        <#}#>

<#if(ds.Tables[0].PrimaryKey != null && ds.Tables[0].PrimaryKey.Length == 1 && ds.Tables[0].PrimaryKey[0].AutoIncrement) {#>
        public static bool Insert(<#=tb_name#> <#=this.ToCamelCase(tb_name)#>) 
        {
            using (var context = db.Context())
            {
                int id = context.Insert<<#=tb_name#>>("<#=tb_name#>", <#=this.ToCamelCase(tb_name)#>)
                    .AutoMap(x => x.<#=primaryKeyParams[0]#>)
                    .ExecuteReturnLastId<int>();

                <#=this.ToCamelCase(tb_name)#>.<#=primaryKeyParams[0]#> = id;
                return id > 0;
            }
        }
<#
}
else
{
#>
        public static bool Insert(<#=tb_name#> <#=this.ToCamelCase(tb_name)#>) 
        {
            using (var context =db.Context())
            {
                return context.Insert<<#=tb_name#>>("<#=tb_name#>", <#=this.ToCamelCase(tb_name)#>)
                    .Execute() > 0;
            }
        }
<#}#>
        public static bool Update(<#=tb_name#> <#=this.ToCamelCase(tb_name)#>)
        {
            using (var context = db.Context())
            {
                return context.Update<<#=tb_name#>>("<#=tb_name#>", <#=this.ToCamelCase(tb_name)#>)
                    .AutoMap(x => <#=updateAutomap#>)
                    <#foreach(string pkp in primaryKeyParams){#>
                    .Where("<#=pkp#>", <#=this.ToCamelCase(tb_name)#>.<#=pkp#>)
                    <#}#>
                    .Execute() > 0;
            }
        }

        public static bool Delete(<#=tb_name#> <#=this.ToCamelCase(tb_name)#>) 
        {
            return Delete(<#=string.Join(", ", primaryKeyParams.Select(x=> this.ToCamelCase(tb_name) + "." + x).ToArray())#>);
        }

        public static bool Delete(<#=string.Join(", ", primaryKeyParamsWithTypes.ToArray())#>)
        {
            using (var context = db.Context())
            {
                return context.Sql(" DELETE FROM Product WHERE <#=string.Join(" AND ", whereItems.ToArray())#> ")
                    <#foreach(string pkp in primaryKeyParams) {
                        WriteLine(".Parameter("" + pkp.ToLower() + "", " + this.ToCamelCase(pkp) + ")");
                    }#>
                    .Execute() > 0;
            }
        }
    }
    
}
    
<#
        manager.EndBlock();    
         }            
        conn.Close();  
       manager.Process(true);  
        #> 



<#+
    public string ToCamelCase(string value)
    {
        if(string.IsNullOrEmpty(value)) 
            return string.Empty;
        
        string firstLetter = value.Substring(0, 1);
        string rest = value.Substring(1, value.Length - 1);
        return firstLetter.ToLower() + rest;
    }
#>

View Code

MultipleOutputHelper.ttinclude

<#@ assembly name="System.Core"
#><#@ assembly name="System.Data.Linq"
#><#@ assembly name="EnvDTE"
#><#@ assembly name="System.Xml"
#><#@ assembly name="System.Xml.Linq"
#><#@ import namespace="System"
#><#@ import namespace="System.CodeDom"
#><#@ import namespace="System.CodeDom.Compiler"
#><#@ import namespace="System.Collections.Generic"
#><#@ import namespace="System.Data.Linq"
#><#@ import namespace="System.Data.Linq.Mapping"
#><#@ import namespace="System.IO"
#><#@ import namespace="System.Linq"
#><#@ import namespace="System.Reflection"
#><#@ import namespace="System.Text"
#><#@ import namespace="System.Xml.Linq"
#><#@ import namespace="Microsoft.VisualStudio.TextTemplating"
#><#+


// Manager class records the various blocks so it can split them up
class Manager {
    private class Block {
        public String Name;
        public int Start, Length;
        public bool IncludeInDefault;
    }

    private Block currentBlock;
    private List<Block> files = new List<Block>();
    private Block footer = new Block();
    private Block header = new Block();
    private ITextTemplatingEngineHost host;
    private StringBuilder template;
    protected List<String> generatedFileNames = new List<String>();

    public static Manager Create(ITextTemplatingEngineHost host, StringBuilder template) {
        return (host is IServiceProvider) ? new VSManager(host, template) : new Manager(host, template);
    }

    public void StartNewFile(String name) {
        if (name == null)
            throw new ArgumentNullException("name");
        CurrentBlock = new Block { Name = name };
    }

    public void StartFooter(bool includeInDefault = true) {
        CurrentBlock = footer;
        footer.IncludeInDefault = includeInDefault;
    }

    public void StartHeader(bool includeInDefault = true) {
        CurrentBlock = header;
        header.IncludeInDefault = includeInDefault;
    }

    public void EndBlock() {
        if (CurrentBlock == null)
            return;
        CurrentBlock.Length = template.Length - CurrentBlock.Start;
        if (CurrentBlock != header && CurrentBlock != footer)
            files.Add(CurrentBlock);
        currentBlock = null;
    }

    public virtual void Process(bool split, bool sync = true) {
        if (split) {
            EndBlock();
            String headerText = template.ToString(header.Start, header.Length);
            String footerText = template.ToString(footer.Start, footer.Length);
            String outputPath = Path.GetDirectoryName(host.TemplateFile);
            files.Reverse();
            if (!footer.IncludeInDefault)
                template.Remove(footer.Start, footer.Length);
            foreach(Block block in files) {
                String fileName = Path.Combine(outputPath, block.Name);
                String content = headerText + template.ToString(block.Start, block.Length) + footerText;
                generatedFileNames.Add(fileName);
                CreateFile(fileName, content);
                template.Remove(block.Start, block.Length);
            }
            if (!header.IncludeInDefault)
                template.Remove(header.Start, header.Length);
        }
    }

    protected virtual void CreateFile(String fileName, String content) {
        if (IsFileContentDifferent(fileName, content))
            File.WriteAllText(fileName, content);
    }

    public virtual String GetCustomToolNamespace(String fileName) {
        return null;
    }

    public virtual String DefaultProjectNamespace {
        get { return null; }
    }

    protected bool IsFileContentDifferent(String fileName, String newContent) {
        return !(File.Exists(fileName) && File.ReadAllText(fileName) == newContent);
    }

    private Manager(ITextTemplatingEngineHost host, StringBuilder template) {
        this.host = host;
        this.template = template;
    }

    private Block CurrentBlock {
        get { return currentBlock; }
        set {
            if (CurrentBlock != null)
                EndBlock();
            if (value != null)
                value.Start = template.Length;
            currentBlock = value;
        }
    }

    private class VSManager: Manager {
        private EnvDTE.ProjectItem templateProjectItem;
        private EnvDTE.DTE dte;
        private Action<String> checkOutAction;
        private Action<IEnumerable<String>> projectSyncAction;

        public override String DefaultProjectNamespace {
            get {
                return templateProjectItem.ContainingProject.Properties.Item("DefaultNamespace").Value.ToString();
            }
        }

        public override String GetCustomToolNamespace(string fileName) {
            return dte.Solution.FindProjectItem(fileName).Properties.Item("CustomToolNamespace").Value.ToString();
        }

        public override void Process(bool split, bool sync) {
            if (templateProjectItem.ProjectItems == null)
                return;
            base.Process(split, sync);
            if (sync)
                projectSyncAction.EndInvoke(projectSyncAction.BeginInvoke(generatedFileNames, null, null));
        }

        protected override void CreateFile(String fileName, String content) {
            if (IsFileContentDifferent(fileName, content)) {
                CheckoutFileIfRequired(fileName);
                File.WriteAllText(fileName, content);
            }
        }

        internal VSManager(ITextTemplatingEngineHost host, StringBuilder template)
            : base(host, template) {
            var hostServiceProvider = (IServiceProvider) host;
            if (hostServiceProvider == null)
                throw new ArgumentNullException("Could not obtain IServiceProvider");
            dte = (EnvDTE.DTE) hostServiceProvider.GetService(typeof(EnvDTE.DTE));
            if (dte == null)
                throw new ArgumentNullException("Could not obtain DTE from host");
            templateProjectItem = dte.Solution.FindProjectItem(host.TemplateFile);
            checkOutAction = (String fileName) => dte.SourceControl.CheckOutItem(fileName);
            projectSyncAction = (IEnumerable<String> keepFileNames) => ProjectSync(templateProjectItem, keepFileNames);
        }

        private static void ProjectSync(EnvDTE.ProjectItem templateProjectItem, IEnumerable<String> keepFileNames) {
            var keepFileNameSet = new HashSet<String>(keepFileNames);
            var projectFiles = new Dictionary<String, EnvDTE.ProjectItem>();
            var originalFilePrefix = Path.GetFileNameWithoutExtension(templateProjectItem.get_FileNames(0)) + ".";
            foreach(EnvDTE.ProjectItem projectItem in templateProjectItem.ProjectItems)
                projectFiles.Add(projectItem.get_FileNames(0), projectItem);

            // Remove unused items from the project
            foreach(var pair in projectFiles)
                if (!keepFileNames.Contains(pair.Key) && !(Path.GetFileNameWithoutExtension(pair.Key) + ".").StartsWith(originalFilePrefix))
                    pair.Value.Delete();

            // Add missing files to the project
            foreach(String fileName in keepFileNameSet)
                if (!projectFiles.ContainsKey(fileName))
                    templateProjectItem.ProjectItems.AddFromFile(fileName);
        }

        private void CheckoutFileIfRequired(String fileName) {
            var sc = dte.SourceControl;
            if (sc != null && sc.IsItemUnderSCC(fileName) && !sc.IsItemCheckedOut(fileName))
                checkOutAction.EndInvoke(checkOutAction.BeginInvoke(fileName, null, null));
        }
    }
} #>

View Code

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原文地址：https://www.cnblogs.com/springsnow/p/10363911.html